Mathematics – Logic
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8652s&link_type=abstract
HST Proposal ID #8652
Mathematics
Logic
Hst Proposal Id #8652 Quasar Absorption Lines And Igm
Scientific paper
The extinction curve has been determined precisely in only a few galaxies: the Milky Way {MW}, the Large and Small Magellanic clouds {LMC and SMC}. It has also been determined towards several starburst galaxies, but its significance then depends on the precise star-gas-dust geometry. There is no general agreement on a model to explain its characteristics; laboratory experiments fail to reproduce the famous 2175Angstrom feature under the conditions of the popular silicate-graphite model. The MW, LMC and SMC extinction curves are generally used to bracket extinction curves in other galaxies. Extinction by dust influences the determination of the Hubble constant from cepheids, of Omega_mathrm M and Lambda using Type Ia Supernovae or gravitational lenses, of the cosmological density of gas and star formation history and the origin the Cosmic Infrared Background. A larger sample of extinction curves is thus urgently needed. Recently, Jean & Surdej {1998} described a method to recover the extinction curve based on high signal-to-noise, low-resolution spectra of the multiple images of gravitationally lensed quasars. Here, we apply this method to a quadruply imaged quasars in order to recover the extinction curve of a galaxy with redshift close to 0.7. We will also measure the HI column density along each line-of-sight to each component in order to estimate the gas-to-dust ratio.
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